On Fri, Jan 26, 2024 at 8:16 AM Tom Lendacky <thomas.lenda...@amd.com> wrote:
>
> On 1/26/24 08:29, Gerd Hoffmann wrote:
> > Neat when doing ResetVector coding.
> > Incompatible with TDX and SEV, therefore not enabled by default.
> >
> > Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
>
> Acked-by: Tom Lendacky <thomas.lenda...@amd.com>
>
Acked-by: Erdem Aktas <erdemak...@google.com>
>
> > ---
> > OvmfPkg/ResetVector/QemuDebugCon.asm | 35 +++++++++++++++++++++++++++
> > OvmfPkg/ResetVector/ResetVector.nasmb | 4 +++
> > 2 files changed, 39 insertions(+)
> > create mode 100644 OvmfPkg/ResetVector/QemuDebugCon.asm
> >
> > diff --git a/OvmfPkg/ResetVector/QemuDebugCon.asm
> > b/OvmfPkg/ResetVector/QemuDebugCon.asm
> > new file mode 100644
> > index 000000000000..e385ca1be83a
> > --- /dev/null
> > +++ b/OvmfPkg/ResetVector/QemuDebugCon.asm
> > @@ -0,0 +1,35 @@
> > +;------------------------------------------------------------------------------
> > +; @file
> > +; qemu debug console support macros (based on serial port macros)
> > +;
> > +; Copyright (c) 2008 - 2018, Intel Corporation. All rights reserved.<BR>
> > +; SPDX-License-Identifier: BSD-2-Clause-Patent
> > +;
> > +;------------------------------------------------------------------------------
> > +
> > +%macro debugShowCharacter 1
> > + mov dx, 0x402
> > + mov al, %1
> > + out dx, al
> > +%endmacro
> > +
> > +%macro debugShowHexDigit 1
> > + %if (%1 < 0xa)
> > + debugShowCharacter BYTE ('0' + (%1))
> > + %else
> > + debugShowCharacter BYTE ('a' + ((%1) - 0xa))
> > + %endif
> > +%endmacro
> > +
> > +%macro debugShowPostCode 1
> > + debugShowHexDigit (((%1) >> 4) & 0xf)
> > + debugShowHexDigit ((%1) & 0xf)
> > + debugShowCharacter `\r`
> > + debugShowCharacter `\n`
> > +%endmacro
> > +
> > +BITS 16
> > +
> > +%macro debugInitialize 0
> > + ; not required
> > +%endmacro
> > diff --git a/OvmfPkg/ResetVector/ResetVector.nasmb
> > b/OvmfPkg/ResetVector/ResetVector.nasmb
> > index 5832aaa8abf7..69ce43ef6a96 100644
> > --- a/OvmfPkg/ResetVector/ResetVector.nasmb
> > +++ b/OvmfPkg/ResetVector/ResetVector.nasmb
> > @@ -40,6 +40,10 @@
> > %include "Port80Debug.asm"
> > %elifdef DEBUG_SERIAL
> > %include "SerialDebug.asm"
> > +%elif 0
> > +; Set ^ this to 1 to enable postcodes on the qemu debug console.
> > +; Disabled by default because it is incompatible with SEV and TDX.
> > + %include "QemuDebugCon.asm"
> > %else
> > %include "DebugDisabled.asm"
> > %endif
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